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Product SKU: GM-Drop-Bolt-ADBS

Gatemaster (ADBS) Auto-locking Drop Bolt Side Screw Fixed| Solid Steel Autolocking Dropbolts

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Gatemaster (ADBS) Auto-locking Drop Bolt Side Screw Fixed| Solid Steel Autolocking Dropbolts

Product SKU: GM-Drop-Bolt-ADBS

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$249.00

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  • Auto-locking Dropbolt Side Fixed | Made From Solid Steel | Diameter of Dropbolt: 19mm | Dropbolt Movement: 100mm

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Product Information

Gatemaster Autolocking Drop Bolt (ADB) | Solid Steel

This robust autolocking drop bolt is designed for securing double gates and can be either welded or screwed in place. Its clever design ensures that the lifting plate sits between the two gate leaves, preventing the dropbolt from being lifted unless the gate is unlocked.

Available in both weldable and screw-fixed versions, this dropbolt is suitable for use with metal or timber gates.

  • Made from solid steel
  • Diameter of dropbolt: 19mm
  • Dropbolt movement: 100mm

Features

  1. Auto-locking Mechanism
    The drop-bolt is manually lowered and twisted so its lifting plate folds around the edge of the first gate. Once the second gate closes, it locks the bolt in place, making it impossible to lift until the gate is reopened. 
     
  2. Heavy-Duty Build
    Constructed from solid steel, available in either galvanised or stainless-steel variants for corrosion resistance and durability 
     
  3. Bolt Dimensions
    19 mm diameter drop-bolt with a movement (throw) of approximately 100 mm (4")
     
  4. Mounting 
    Installation type:
    - ADBS: Screw-fixed 
     
  5. Left/Right Compatibility
    Can be oriented for left- or right-hand gate setups, simply by rotating the lifting plate before mounting 
     
  6. Simple Installation
    The screw-mounted version requires just two 15 mm drilled holes and uses self-expanding fasteners; the weld version, on the other hand, needs a locating tube welded into the gate post with lift-plate alignment. 
     
  7. Adaptable & Secure
    Compatible with steel, aluminium, and wooden gates. Its design prevents spread or forced opening when both gates are closed — even under wind or load 

Summary Table

Feature Description
Locking Design Bolt locks automatically when both gates are closed
Material Solid steel; galvanised or stainless options
Bolt Diameter/Movement 19 mm diameter, 100 mm (4") throw
Mounting Method Screw-Fixed (ADBS)
Gate Orientation Suitable for left-hand or right-hand configurations
Installation Minimal tools needed; screw-on uses self-expanding fasteners
Gate Compatibility Suitable for steel, timber or aluminium double gates

Why You’d Choose the Auto-Locking Drop Bolt

  • Security-first design: automatically prevents the bolt from being lifted—a mechanical locking safeguard with no electronics.

  • Versatility: install in completed gates (Side Fixed Screw Version).

  • Robust construction: solid steel design resists tampering, weathering, and force.

  • Simplified installation: minimal drilling or welding makes it straightforward and installer-friendly.